PISO is essentially the reverse of SIPO used by the 74HC595, it allows you to gather a large number of inputs, like buttons and transmit it serially. This article talks about PISO registers https://learn.sparkfun.com/tutorials/shift-registers
PISO is essentially the reverse of SIPO used by the 74HC595, it allows you to gather a large number of inputs, like buttons and transmit it serially.
This article talks about PISO registers
https://learn.sparkfun.com/tutorials/shift-registers